Intermittent-gripping device.



UNITED srArEs PArENr o EroE.

GEORGE A. ANDERSON. 0E ANAoonTEs, AND THORSTEN H. MAUEsE'rE; oE. SEATTLE,

WASHINGTON.

INTERMITTENT-GRIPPING DEVICE.

To all whom it may concern:

Be it known that we, GEORGE A. ANDER- SON and THORSTEN H. MAURSETH, citizens of the United States, and residents, respectively,

of the city of Anacortes, county of Skagit,

State of Washington, and thecity of Seattle, county of King, State of Washington, have invented certain new and useful Improvements in Intermittent-Gripping Devices, of which the following is a specification.

The object of our invention is to provide a type of feed operating device which may be adjusted to feed any exact amount desired, this adjustment, being not limited to definite points, but being capable of adjustment without any limitation of amount with-' in its extreme limits.

Our object further, is to provide a device In the accompanying drawings we have shown our invention embodied in the form of construction which is now most preferred by us.

Figure 1 is a side elevation of our device, and the members by which it is connected with the shingle sawing machine for operation.

Fig. 2 is an end view of the same parts with the clutch case in section.

Fig. 3 is a face view of a modified con struction, with its face plate removed.

Fig. 4 is an edge view of thesame, w1th the casing in section. r

Fig. 5 shows a difierent type of grlppmg element.

In shingle sawing machines of the type for which this has been especially designed, the block from which the shingles are sawed is supported in a carriage which reciprocates to and past the saw, and means are provided whereby the carriage is fed laterally of its direction of reciprocation. at each reciprocation, thereby advancing the block an amount such that in passing the saw a new shingle will be out 011". Our feed device is intended for operating said latter feed of the carriage- I Specification of Letters Patent. I Application filed. January 19, 1916. Serial No. 73,066.

Patented. Aug. '7,

which feeds the shingle block. We have not here1n attempted to show the distinctive part-s of a shingle machine, but only the parts which are directly connected and operated by our device.

A shaft 1 is used for actuating the mecha-' n1sm by which the block is fed to the saw.

This shaft has an intermittent rotative movement continuously in the same direction. It is the actuating of this shaft in exactly meas. ured and easily regulable amounts, which is the'purpose of our invention. We will first describe in detail the type of construction shownin Figs. 1 and 2.:

The shaft 1 has secured thereto a member, which as herein shown, consists of a spider 10, having outwardly projecting arms or teeth 11, these being three in number as herein shown. This/spider is. also provided with a series of exterior grooves 12, which have a surface in the shape of an arc of a circle, these being pivot recesses for the re' ception of toes 20 of the clutch or active gripping blocks 2.

These recesses 12, in the form of construe-l tion shown in Fig. 1, arein number twice the number of the arms 11. Thisrelationship is to provide for reversing of the position of the blocks 2, whereby the direction of feed of the device may be reversed. In the type shown in Fig. 3 they. are in number the same as are the arms 110 and are located centrally between said arms. v r Journaled upon the shaft 1 outside of the spider 10 is a disk 4, which hasa flange 40 having a circular inner surface concentric with the shaft and facing the spider 10, which constitutes the driven member.- The flange lO and its disk'constitute the driving member of thedevice. Clutch blocks 2 are used to connect said driving and driven members. The clutch blocks have each a toe 20 fitted to enter the pivot recesses 12 of the driven spider 10, and having an outer 1 surface which is ofcurved shape not. concentric with the-same point as is the inner be transmitted between them.

' The eccentricity of the outer surfaces of theclutch dogs may be suflicient to cause ample gripping action, but we do not rely wholly, or even principally, upon this action. The surface of shoulder 21 and the surfaces 13 of the spider are so shaped that the rocking of the dogs cause the dogs to thereby be forced powerfully out against theinner surface lO of the inclosing flange.

' .Springs 3 are employed to connect each dog with its companion arm 11, these acting with suflicient force to cause a slight but continuous bearing of the outer surface of the dogs upon the inner surface of the flange 10. If. it is desired by the construction shown in Figs. 1: and, 2, totransmit movement in the opposite way between these two members, the clutch dogs 20 may be inverted in position "and placed, each inits companion pivot recess 12, the spring 3 being at the same time situated so as to be connected with the arm 11 which is located in opposite direction from the clutch dog.

The construction shown in Figs. 4 and 5 is the same in principle, but differs in details. The dogsas here shown have a recess extending across their face at the point where gripping contact occurs with the flange surface 10. In this recess is placed a member which will securely bite and hold against the flange surface and which will not quickly wear- A hardened steel pin 24; is effective for this purpose. As a modification, a thin plate 26, may be inserted in a slot, as is shown in Fig. 5.

In this type of construction, a plate spring '30 may be used, its ends engaging under ledges or shoulders 25 on the dog and 111 on the arm. To reverse the direction of action of the dogs, they may be reversed in position, their pivot toes entering the same socket. The driving member t may be oscillated through any convenient and suitable mechanism. The mechanism herein shown comprises the follox ving parts:

1 A bar 5 has a yoke 50 at one end thereof, the'sides of this yoke being separated enough to permit its sides straddling the clutch device. The yoke end is connected by the pivot bolt 51 with the driving member of the clutch. The opposite end of this bar is connected by pin 56 with the depending arm of the bell crank lever 6, which has part carried by therframe.

its other arm engaged by a tappet cam or wedge block 8, which is connected to reciprocate with the carriage which carries the shingle block. This wedge block may be mounted to reciprocate in guides 80, mounted upon the frame of the machine. Each reciprocation of the carriage will thus actuate the bell crank lever an amount determined by the length of the inclined surface of the cam, which contacts therewith. The bell crank lever is returned in opposition to the direction of movement by the cam through a spring 67 or by any other suitable device.

To regulate the extent of the feeding movement communicated to the clutch device, we have provided two adjusting bolts.

These two bolts may be used together, or

' either may be used alone as desired. The

bolt 90 screws the bell crank lever, and its end is designed to contact with a fixed It is provided with a spring 91 under its head, this acting as a means for holding the bolt in adjusted position. The bolt 90 is of similar construction, butis mounted in a member of the frame. 9

The extent of the inclined surface of the cam which is effective to oscilla te the bell crank by contacting therewith-,,th at is the point thereon where the cam roller 61 first contacts therewith determines the extent of throw of the bell crank lever. If the contact of the cam roller is postponed to a later point the extent of movement will be correspondingly reduced. In:this way by controlling the pointto which the bell crank lever is returned the extent of movement given the clutch feeding devicemay be very accurately controlled.

The chamber comprised within the flange 40 ofthe driving member is preferably inclosed by a part asel, which is secured thereto by bolts 4:2.

It is evident bythe above device the extent of the feed may be accurately and conveniently adjusted, even while the machine isin operation. The clutch device is also of a positive character, so that the feed will bepositiveand exactly the same each time.

lVhat we claim as our invention is:

1. An intermittent gripping device comprising a spider secured upon a driven shaft, a plurality of pivot recesses in said spider, bearing surfaces on said spider adjacent to said recesses, a driving member mounted to oscillate about the axis of the driven member and having an inwardly facing clutch surface concentric to said axis, clutch dogs each consisting of a block having a toe adapted to enter and to pivot in one of said pivot recesses, the outer bearing surface of each dog being eccentric to its pivot-al point, a laterally extendin shoulder at one side of said toe adapted toenga'ge with said bearing surface upon the spider, 1ind means for oscillating the driving mem- 61'.

2. An intermittent gripping device comprising a driven member consisting of a spider having a plurality of radially projecting arms, pivot recesses in said spider between said arms, bearing surfaces on said spider adjacent said recesses, a driving member mounted to oscillate about the axis of the driven member and having an inwardly facing clutch surface concentric to said axis, clutch dogs each consisting of a block having a toe adapted to enter and pivot in one of said pivot recesses, the outer bearing surface of each dog being curved eccentrically to its pivotal point, a laterally extending shoulder at one side of said toe adapted to engage with said bearing surface upon the spider, springs connecting said dogs and said radially projecting arms upon the spider, and means for oscillating said driving member. s

3. An intermittent gripping device comprising a driven member consisting of a spider secured upon a driven shaft, a plurality of pivot recesses in said spider, bearing surfaces on said spider adjacent to said recesses, a driving member mounted to oscillate about the axis of the driven member and having an inwardly facing clutch surface concentric to said axis, clutch dogs each consisting of a block having a toe adapted to enter and to pivot in one of said pivot recesses, the outer bearing surface of each dog being curved eccentrically to its pivotal point, a laterally extending shoulder at one side of said toe, said shoulder being so curved with respect to the point of contact of the dog and the clutch surface of the driving member that the distance from the point of contact gradually increases with the increasing angle of inclination of the dog, said shoulder being adapted to bear upon the bearing surfaces upon said spider, 125nd means for oscillating said driving mem- 4. An intermittent gripping device comprising a driven member consisting of va spider secured upon a driven shaft, a plurality of pivot recesses in said spider, bearing surfaces on said spider adjacent to said recesses and concentric with said shaft, a

ber that the distance from the pointof contact gradually increaseswith the increasing angle of inclination of the dog, said shoulder being adapted to bear upon the bearing surfaces upon said spider, and means for oscillating said driving member.

5. An intermittent gripping device comprising a driven member consisting of a spider having a plurality of radially-projecting arms and secured upon a driven shaft, a pivot recess at each side of each of said projecting arms, bearing surfaces on said spider adjacent to said recesses and concentric with said shaft, a driving member mounted to oscillate about the axis of the driven member and having an inwardly facing clutch surface concentric to said axis,

clutch dogs each consisting of a block having a toe adapted to enter and to pivot-in one of said pivot recesses, the outer bearing surface of said dog being curved eccentriccally to its pivot point, a laterally extending shoulder at one side of said toe, said shoulder being so curved with respect to the point of contact of the dog and the clutch surface of the driving member that the distance from the point of contact gradually increases with the increasing angle of inclination of the dog, said shoulder being adapted to bear upon the bearing surfaces upon said spider, springs connecting said dogs and said radial arms, and means for oscillating said driving member. 7

Signed by GEORGE A. ANDERSON at Anacortes, Washington, this 7th day of January, 1916, and by TnoRs'rnN H. MAURSETH at Seattle, Washington, this v7th day of January, 1916.

GEORGE A. ANDERSON. THORSTEN 1-1. MAURSETH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

